如何将cwac-Camera集成到我的应用程序中

Question

我已经集成了cwac-camera库，但遇到错误，即使我尝试运行lib提供的camera-demo，也会遇到错误

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.commonsware.cwac.camera.CameraView.lockToLandscape(boolean)' on a null object reference

FATAL EXCEPTION: main
 Process: com.commonsware.cwac.camera.demo, PID: 22883
 java.lang.NullPointerException: Attempt to invoke virtual method 'void com.commonsware.cwac.camera.CameraView.lockToLandscape(boolean)' on a null object reference
    at com.commonsware.cwac.camera.CameraFragment.lockToLandscape(CameraFragment.java:197)
    at com.commonsware.cwac.camera.demo.MainActivity$1.run(MainActivity.java:120)
    at android.os.Handler.handleCallback(Handler.java:738)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5070)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:836)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:631)

帮助将会得到评价。

我正在使用Nexus5 OS Android L进行测试，

Answer 1

您正在null上调用lockToLandscape()，而不是在CameraView的实例上调用。